CIFS remote shares freeze on resume after suspend

[MATilley]

After resuming session from a suspend on my Dell XPS 13, any previously remotely mounted CIFS shares are non-responsive, lock the terminal on attempts to interact with the associated directories in any way (tab complete, cd, ls, etc.). In system logs, I see the following:

[31218.531445] INFO: task bash:16585 blocked for more than 120 seconds.
[31218.531454] Tainted: G OE 3.16.0-30-generic #40-Ubuntu
[31218.531456] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[31218.531460] bash D ffff88021f293840 0 16585 1983 0x00000004
[31218.531468] ffff8801be323a60 0000000000000086 ffff8800a3b80a30 0000000000013840
[31218.531474] ffff8801be323fd8 0000000000013840 ffff8800a3b80a30 ffff88020fc93e20
[31218.531479] ffff88020fc93e24 ffff8800a3b80a30 00000000ffffffff ffff88020fc93e28
[31218.531484] Call Trace:
[31218.531497] [<ffffffff81785a89>] schedule_preempt_disabled+0x29/0x70
[31218.531504] [<ffffffff81788025>] __mutex_lock_slowpath+0xd5/0x1f0
[31218.531511] [<ffffffff8178815f>] mutex_lock+0x1f/0x30
[31218.531523] [<ffffffffc08b2399>] cifs_reconnect_tcon+0x169/0x2e0 [cifs]
[31218.531533] [<ffffffffc08b25ca>] smb_init+0x2a/0x50 [cifs]
[31218.531544] [<ffffffffc08b81ca>] CIFSSMBQPathInfo+0x5a/0x2b0 [cifs]
[31218.531561] [<ffffffffc08dc9d7>] cifs_query_path_info+0x67/0x1a0 [cifs]
[31218.531571] [<ffffffff811eb7f2>] ? __inode_permission+0x52/0xe0
[31218.531578] [<ffffffff811eb898>] ? inode_permission+0x18/0x50
[31218.531588] [<ffffffff811c3573>] ? kmem_cache_alloc_trace+0x193/0x1e0
[31218.531603] [<ffffffffc08ce89b>] ? cifs_get_inode_info+0x3cb/0x8a0 [cifs]
[31218.531615] [<ffffffffc08ce8f9>] cifs_get_inode_info+0x429/0x8a0 [cifs]
[31218.531622] [<ffffffff811ead51>] ? complete_walk+0x51/0x100
[31218.531629] [<ffffffff811c3a29>] ? __kmalloc+0x169/0x260
[31218.531642] [<ffffffffc08c3ae6>] ? build_path_from_dentry+0xb6/0x2c0 [cifs]
[31218.531653] [<ffffffffc08c3ae6>] ? build_path_from_dentry+0xb6/0x2c0 [cifs]
[31218.531666] [<ffffffffc08d08af>] cifs_revalidate_dentry_attr+0xef/0x1c0 [cifs]
[31218.531679] [<ffffffffc08d0a31>] cifs_getattr+0x51/0x120 [cifs]
[31218.531685] [<ffffffff811e5c3c>] vfs_getattr_nosec+0x2c/0x40
[31218.531690] [<ffffffff811e5cfd>] vfs_getattr+0x2d/0x40
[31218.531695] [<ffffffff811e5dd4>] vfs_fstatat+0x64/0xa0
[31218.531700] [<ffffffff811e625f>] SYSC_newstat+0x1f/0x40
[31218.531706] [<ffffffff811e64be>] SyS_newstat+0xe/0x10
[31218.531713] [<ffffffff8178a3ad>] system_call_fastpath+0x1a/0x1f

And it seems this has affected several users:

http://ubuntuforums.org/showthread.php?t=2265959

http://askubuntu.com/questions/417874/cifs-vfs-server-xxx-has-not-responded-in-120-seconds

http://ubuntuforums.org/showthread.php?t=2224655

http://ubuntuforums.org/showthread.php?t=2256773

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: cifs-utils 2:6.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Feb 22 00:36:33 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-09-27 (148 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
SourcePackage: cifs-utils
UpgradeStatus: Upgraded to utopic on 2015-02-04 (17 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[MATilley (matilley)]

Still occurring one year later, with new kernel and slightly modified call stack:

[23774.418572] INFO: task pool:25233 blocked for more than 120 seconds.
[23774.418582] Not tainted 3.19.0-51-generic #58~14.04.1-Ubuntu
[23774.418585] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[23774.418589] pool D ffff88014043b9b8 0 25233 1886 0x00000000
[23774.418598] ffff88014043b9b8 ffff880085b83110 0000000000013e80 ffff88014043bfd8
[23774.418605] 0000000000013e80 ffff8802128aa740 ffff880085b83110 ffff880085b83110
[23774.418611] ffff8801d5685220 ffff8801d5685224 ffff880085b83110 00000000ffffffff
[23774.418617] Call Trace:
[23774.418633] [<ffffffff817b3a29>] schedule_preempt_disabled+0x29/0x70
[23774.418642] [<ffffffff817b5745>] __mutex_lock_slowpath+0x95/0x100
[23774.418651] [<ffffffff817b57d3>] mutex_lock+0x23/0x37
[23774.418674] [<ffffffffc0b25658>] cifs_reconnect_tcon+0xa8/0x330 [cifs]
[23774.418684] [<ffffffff811a5856>] ? handle_mm_fault+0x936/0x10d0
[23774.418700] [<ffffffffc0b2598e>] smb_init+0x2e/0x60 [cifs]
[23774.418718] [<ffffffffc0b2beca>] CIFSSMBQPathInfo+0x5a/0x270 [cifs]
[23774.418725] [<ffffffff81193d80>] ? zone_statistics+0x80/0xa0
[23774.418751] [<ffffffffc0b53b4f>] cifs_query_path_info+0x6f/0x1b0 [cifs]
[23774.418761] [<ffffffffc08deb89>] ? do_expire_wait+0xd9/0x1e0 [autofs4]
[23774.418771] [<ffffffff811cef19>] ? kmem_cache_alloc_trace+0x199/0x220
[23774.418793] [<ffffffffc0b43c2c>] ? cifs_get_inode_info+0x30c/0x9a0 [cifs]
[23774.418813] [<ffffffffc0b43c8a>] cifs_get_inode_info+0x36a/0x9a0 [cifs]
[23774.418821] [<ffffffff811f6dab>] ? lookup_fast+0xbb/0x2c0
[23774.418840] [<ffffffffc0b37bde>] ? build_path_from_dentry+0xae/0x2b0 [cifs]
[23774.418857] [<ffffffffc0b37bde>] ? build_path_from_dentry+0xae/0x2b0 [cifs]
[23774.418873] [<ffffffffc0b37bde>] ? build_path_from_dentry+0xae/0x2b0 [cifs]
[23774.418893] [<ffffffffc0b45f67>] cifs_revalidate_dentry_attr+0x197/0x200 [cifs]
[23774.418901] [<ffffffff811fd00f>] ? user_path_at_empty+0x5f/0xa0
[23774.418919] [<ffffffffc0b46087>] cifs_getattr+0x57/0x130 [cifs]
[23774.418927] [<ffffffff81347ddb>] ? common_perm_cond+0x2b/0x30
[23774.418933] [<ffffffff811f0cec>] vfs_getattr_nosec+0x2c/0x40
[23774.418938] [<ffffffff811f0dbd>] vfs_getattr+0x2d/0x40
[23774.418944] [<ffffffff811f0e92>] vfs_fstatat+0x62/0xa0
[23774.418949] [<ffffffff811f1362>] SYSC_newlstat+0x22/0x40
[23774.418955] [<ffffffff811fffb5>] ? SyS_getdents+0xd5/0x100
[23774.418960] [<ffffffff811ffc40>] ? fillonedir+0xd0/0xd0
[23774.418966] [<ffffffff811f159e>] SyS_newlstat+0xe/0x10
[23774.418975] [<ffffffff817b788d>] system_call_fastpath+0x16/0x1b

[Jaap de Haan (jaap-dehaan)]

[ 3240.018757] INFO: task umount:6807 blocked for more than 120 seconds.
[ 3240.018779] Not tainted 4.4.0-47-generic #68-Ubuntu
[ 3240.018798] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3240.018823] umount D ffff880213c079e8 0 6807 6770 0x00000004
[ 3240.018825] ffff880213c079e8 0000000000000000 ffffffff81e11500 ffff8802126c3700
[ 3240.018827] ffff880213c08000 ffff880212669a24 ffff8802126c3700 00000000ffffffff
[ 3240.018829] ffff880212669a28 ffff880213c07a00 ffffffff81830f15 ffff880212669a20
[ 3240.018831] Call Trace:
[ 3240.018833] [<ffffffff81830f15>] schedule+0x35/0x80
[ 3240.018834] [<ffffffff818311be>] schedule_preempt_disabled+0xe/0x10
[ 3240.018836] [<ffffffff81832df9>] __mutex_lock_slowpath+0xb9/0x130
[ 3240.018838] [<ffffffff81832e8f>] mutex_lock+0x1f/0x30
[ 3240.018848] [<ffffffffc047a70d>] cifs_reconnect_tcon+0x9d/0x340 [cifs]
[ 3240.018850] [<ffffffff811eb999>] ? ___slab_alloc+0x1e9/0x470
[ 3240.018860] [<ffffffffc047aa5a>] smb_init+0x2a/0x50 [cifs]
[ 3240.018869] [<ffffffffc0481c53>] CIFSSMBQPathInfo+0x63/0x2e0 [cifs]
[ 3240.018875] [<ffffffff811aeb4c>] ? zone_statistics+0x7c/0xa0
[ 3240.018886] [<ffffffffc04ad14f>] cifs_query_path_info+0x6f/0x1a0 [cifs]
[ 3240.018889] [<ffffffff81218b84>] ? lookup_fast+0x184/0x330
[ 3240.018891] [<ffffffff811ebf23>] ? kmem_cache_alloc_trace+0x183/0x1f0
[ 3240.018893] [<ffffffff81218b84>] ? lookup_fast+0x184/0x330
[ 3240.018903] [<ffffffffc049bdc0>] cifs_get_inode_info+0x390/0x8f0 [cifs]
[ 3240.018906] [<ffffffff81218971>] ? unlazy_walk+0xc1/0x150
[ 3240.018908] [<ffffffff811ed5b9>] ? __kmalloc+0x1b9/0x250
[ 3240.018918] [<ffffffffc048edb2>] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
[ 3240.018927] [<ffffffffc048edb2>] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
[ 3240.018937] [<ffffffffc049e365>] cifs_revalidate_dentry_attr+0x1d5/0x250 [cifs]
[ 3240.018939] [<ffffffff811ec1a7>] ? kmem_cache_alloc+0x187/0x1f0
[ 3240.018949] [<ffffffffc049e491>] cifs_getattr+0x51/0x110 [cifs]
[ 3240.018951] [<ffffffff812126cc>] vfs_getattr_nosec+0x2c/0x40
[ 3240.018953] [<ffffffff812128e6>] vfs_getattr+0x26/0x30
[ 3240.018954] [<ffffffff812129c8>] vfs_fstatat+0x78/0xc0
[ 3240.018956] [<ffffffff81212f0e>] SYSC_newstat+0x2e/0x60
[ 3240.018960] [<ffffffff81003226>] ? exit_to_usermode_loop+0xa6/0xd0
[ 3240.018961] [<ffffffff8121309e>] SyS_newstat+0xe/0x10
[ 3240.018963] [<ffffffff81834ff2>] entry_SYSCALL_64_fastpath+0x16/0x71

running Ubuntu 16.04 (4.4.0-47-generic #68-Ubuntu SMP Wed Oct 26 19:39:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux) and running in a virtual box VM.

[Raymond Paskvyl (rayymondek)]

Have same trouble, seems to be related to TCP network connection break:

May 26 10:08:57 station8 kernel: [ 6840.142121] INFO: task xfce4-panel:1620 blocked for more than 120 seconds.
May 26 10:08:57 station8 kernel: [ 6840.142143] Not tainted 4.4.0-78-generic #99-Ubuntu
May 26 10:08:57 station8 kernel: [ 6840.142153] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 26 10:08:57 station8 kernel: [ 6840.142164] xfce4-panel D ffff8802744239e8 0 1620 1448 0x00000000
May 26 10:08:57 station8 kernel: [ 6840.142189] ffff8802744239e8 ffff8802744239d0 ffff880276661980 ffff880270a3e600
May 26 10:08:57 station8 kernel: [ 6840.142209] ffff880274424000 ffff88027540bc24 ffff880270a3e600 00000000ffffffff
May 26 10:08:57 station8 kernel: [ 6840.142228] ffff88027540bc28 ffff880274423a00 ffffffff8183c8f5 ffff88027540bc20
May 26 10:08:57 station8 kernel: [ 6840.142247] Call Trace:
May 26 10:08:57 station8 kernel: [ 6840.142278] [<ffffffff8183c8f5>] schedule+0x35/0x80
May 26 10:08:57 station8 kernel: [ 6840.142297] [<ffffffff8183cb9e>] schedule_preempt_disabled+0xe/0x10
May 26 10:08:57 station8 kernel: [ 6840.142313] [<ffffffff8183e7d9>] __mutex_lock_slowpath+0xb9/0x130
May 26 10:08:57 station8 kernel: [ 6840.142334] [<ffffffff8183e86f>] mutex_lock+0x1f/0x30
May 26 10:08:57 station8 kernel: [ 6840.142449] [<ffffffffc06a170d>] cifs_reconnect_tcon+0x9d/0x340 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.142553] [<ffffffffc06a1a5a>] smb_init+0x2a/0x50 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.142657] [<ffffffffc06a8c53>] CIFSSMBQPathInfo+0x63/0x2e0 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.142775] [<ffffffffc06d420f>] cifs_query_path_info+0x6f/0x1a0 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.142796] [<ffffffff8121a017>] ? lookup_fast+0x57/0x330
May 26 10:08:57 station8 kernel: [ 6840.142816] [<ffffffff811ed343>] ? kmem_cache_alloc_trace+0x183/0x1f0
May 26 10:08:57 station8 kernel: [ 6840.142832] [<ffffffff8121a144>] ? lookup_fast+0x184/0x330
May 26 10:08:57 station8 kernel: [ 6840.142945] [<ffffffffc06c2e80>] cifs_get_inode_info+0x390/0x8f0 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.142963] [<ffffffff81219f31>] ? unlazy_walk+0xc1/0x150
May 26 10:08:57 station8 kernel: [ 6840.142980] [<ffffffff811ee9d9>] ? __kmalloc+0x1b9/0x250
May 26 10:08:57 station8 kernel: [ 6840.143090] [<ffffffffc06b5dd2>] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.143201] [<ffffffffc06b5dd2>] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.143315] [<ffffffffc06c5425>] cifs_revalidate_dentry_attr+0x1d5/0x250 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.143332] [<ffffffff811ed5c7>] ? kmem_cache_alloc+0x187/0x1f0
May 26 10:08:57 station8 kernel: [ 6840.143446] [<ffffffffc06c5551>] cifs_getattr+0x51/0x110 [cifs]
May 26 10:08:57 station8 kernel: [ 6840.143463] [<ffffffff81213c0c>] vfs_getattr_nosec+0x2c/0x40
May 26 10:08:57 station8 kernel: [ 6840.143477] [<ffffffff81213e26>] vfs_getattr+0x26/0x30
May 26 10:08:57 station8 kernel: [ 6840.143492] [<ffffffff81213f08>] vfs_fstatat+0x78/0xc0
May 26 10:08:57 station8 kernel: [ 6840.143508]...

[MATilley (matilley)]

Still occurring in 16.04, kernel 4.4.0.93.

[44880.327833] INFO: task Thunar:7047 blocked for more than 120 seconds.
[44880.327843] Not tainted 4.4.0-93-generic #116-Ubuntu
[44880.327846] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[44880.327850] Thunar D ffff88000a5b3878 0 7047 1607 0x00000000
[44880.327859] ffff88000a5b3878 ffffffff810bdd63 ffff880215a99c00 ffff880211c93800
[44880.327866] ffff88000a5b4000 ffff88012fa65424 ffff880211c93800 00000000ffffffff
[44880.327872] ffff88012fa65428 ffff88000a5b3890 ffffffff8183f0d5 ffff88012fa65420
[44880.327878] Call Trace:
[44880.327892] [<ffffffff810bdd63>] ? load_balance+0x1d3/0x980
[44880.327902] [<ffffffff8183f0d5>] schedule+0x35/0x80
[44880.327908] [<ffffffff8183f37e>] schedule_preempt_disabled+0xe/0x10
[44880.327914] [<ffffffff81840fb9>] __mutex_lock_slowpath+0xb9/0x130
[44880.327924] [<ffffffff8184104f>] mutex_lock+0x1f/0x30
[44880.327974] [<ffffffffc0a890ed>] cifs_reconnect_tcon+0x9d/0x340 [cifs]
[44880.327979] [<ffffffff810b9b35>] ? put_prev_entity+0x35/0x7d0
[44880.327986] [<ffffffff8102d66c>] ? __switch_to+0x1dc/0x5c0
[44880.328014] [<ffffffffc0a8943a>] smb_init+0x2a/0x50 [cifs]
[44880.328044] [<ffffffffc0a90d93>] CIFSSMBQPathInfo+0x63/0x2e0 [cifs]
[44880.328052] [<ffffffff810b2d1c>] ? __enqueue_entity+0x6c/0x70
[44880.328090] [<ffffffffc0abc9af>] cifs_query_path_info+0x6f/0x1a0 [cifs]
[44880.328096] [<ffffffff810b92fa>] ? enqueue_task_fair+0xaa/0x8b0
[44880.328103] [<ffffffff810b4275>] ? select_task_rq_fair+0x625/0x700
[44880.328109] [<ffffffff81037ef9>] ? sched_clock+0x9/0x10
[44880.328115] [<ffffffff810b1d4f>] ? sched_clock_cpu+0x8f/0xa0
[44880.328120] [<ffffffff810ab614>] ? check_preempt_curr+0x54/0x90
[44880.328128] [<ffffffff811ed723>] ? kmem_cache_alloc_trace+0x183/0x1f0
[44880.328133] [<ffffffff810ab669>] ? ttwu_do_wakeup+0x19/0xe0
[44880.328168] [<ffffffffc0aab110>] cifs_get_inode_info+0x390/0x8f0 [cifs]
[44880.328176] [<ffffffff817236eb>] ? __alloc_skb+0x9b/0x1f0
[44880.328182] [<ffffffff811eedb9>] ? __kmalloc+0x1b9/0x250
[44880.328188] [<ffffffff81224103>] ? pollwake+0x73/0x90
[44880.328220] [<ffffffffc0a9e132>] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
[44880.328249] [<ffffffffc0a9e1a9>] ? build_path_from_dentry+0x159/0x3e0 [cifs]
[44880.328282] [<ffffffffc0aad6b5>] cifs_revalidate_dentry_attr+0x1d5/0x250 [cifs]
[44880.328312] [<ffffffffc0aad773>] cifs_revalidate_dentry+0x13/0x30 [cifs]
[44880.328342] [<ffffffffc0a9de47>] cifs_d_revalidate+0x27/0xb0 [cifs]
[44880.328350] [<ffffffff8121a6ff>] lookup_fast+0x24f/0x330
[44880.328357] [<ffffffff8121bdc9>] walk_component+0x49/0x300
[44880.328363] [<ffffffff8121b7bb>] ? path_init+0x1eb/0x3c0
[44880.328370] [<ffffffff8121d8ed>] path_lookupat+0x5d/0x110
[44880.328377] [<ffffffff8121f531>] filename_lookup+0xb1/0x180
[44880.328384] [<ffffffff811ed9bf>] ? kmem_cache_alloc+0x19f/0x1f0
[44880.328390] [<ffffffff8121f136>] ? getname_flags+0x56/0x1f0
[44880.328395] [<ffffffff8121f6d6>] user_path_at_empty+0x36/0x40
[44880.328402] [<ffffffff8120d784>] SyS_access+0xb4/0x230
[44880.328410] [<ffffffff818431f2>] entry_SYSCALL_64_fastpath+0x16/0x71

[MATilley (matilley)]

Still occurring in cifs-utils packge 2:6.4-1ubuntu1.1

[kamiccolo (kamicc)]

Call trace from Ubuntu 16.04 and cifs-utils 2:6.4-1ubuntu1.1 on 4.10.0-42-generic:

[19936.692679] INFO: task ls:15421 blocked for more than 120 seconds.
[19936.692683] Tainted: G W 4.10.0-42-generic #46~16.04.1-Ubuntu
[19936.692685] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[19936.692687] ls D 0 15421 15411 0x00000000
[19936.692691] Call Trace:
[19936.692694] __schedule+0x232/0x700
[19936.692698] schedule+0x36/0x80
[19936.692701] schedule_preempt_disabled+0xe/0x10
[19936.692704] __mutex_lock_slowpath+0x193/0x290
[19936.692708] mutex_lock+0x2f/0x40
[19936.692728] cifs_reconnect_tcon+0x95/0x340 [cifs]
[19936.692733] ? __find_get_block+0x22c/0x260
[19936.692736] ? __check_block_validity.constprop.75+0x31/0x70
[19936.692756] smb_init+0x2a/0x50 [cifs]
[19936.692777] CIFSSMBQPathInfo+0x63/0x2e0 [cifs]
[19936.692805] cifs_query_path_info+0x6f/0x1a0 [cifs]
[19936.692809] ? __kmalloc+0x1c7/0x200
[19936.692812] ? ext4_htree_store_dirent+0x3e/0x120
[19936.692816] ? lookup_fast+0xe3/0x2f0
[19936.692819] ? kmem_cache_alloc_trace+0x152/0x1c0
[19936.692844] cifs_get_inode_info+0x4a3/0x970 [cifs]
[19936.692847] ? unlazy_walk+0xf8/0x180
[19936.692851] ? __kmalloc+0x178/0x200
[19936.692874] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
[19936.692895] ? build_path_from_dentry+0xe2/0x3e0 [cifs]
[19936.692918] cifs_revalidate_dentry_attr+0x1d5/0x250 [cifs]
[19936.692941] cifs_getattr+0x51/0x110 [cifs]
[19936.692946] vfs_getattr_nosec+0x29/0x40
[19936.692949] vfs_getattr+0x26/0x30
[19936.692953] vfs_fstatat+0x78/0xc0
[19936.692958] SYSC_newlstat+0x31/0x60
[19936.692963] SyS_newlstat+0xe/0x10
[19936.692967] entry_SYSCALL_64_fastpath+0x1e/0xad
[19936.692969] RIP: 0033:0x7f927b0afc55
[19936.692971] RSP: 002b:00007ffc7a297c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
[19936.692974] RAX: ffffffffffffffda RBX: 00007f927b37db20 RCX: 00007f927b0afc55
[19936.692975] RDX: 000000000159ed60 RSI: 000000000159ed60 RDI: 00007ffc7a297ca0
[19936.692977] RBP: 0000000000008041 R08: 0000000000000000 R09: 00000000000003c0
[19936.692978] R10: 00000000000001cc R11: 0000000000000246 R12: 00007f927b37db78
[19936.692980] R13: 00007f927b37db78 R14: 0000000000002710 R15: 0000000000404ad0

[mbzi (bzied)]

Call trace from :

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"

Kernel :

4.15.0-1013-azure

[509728.136002] watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [nginx:57149]
[509728.136002] Modules linked in: binfmt_misc nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_multiport iptable_security xt_conntrack nf_conntrack iptable_filter ip_tables x_tables cmac arc4 md4 nls_utf8 cifs ccm fscache kvm_intel kvm irqbypass hv_balloon serio_raw joydev autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear crct10dif_pclmul hid_generic crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd hyperv_keyboard hid_hyperv hid hv_utils hv_netvsc hyperv_fb cfbfillrect cfbimgblt cfbcopyarea pata_acpi
[509728.136002] CPU: 1 PID: 57149 Comm: nginx Tainted: G D L 4.15.0-1013-azure #13~16.04.2-Ubuntu
[509728.136002] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017
[509728.136002] RIP: 0010:native_queued_spin_lock_slowpath+0x25/0x1a0
[509728.136002] RSP: 0018:ffffbc80c5de3d30 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff0c
[509728.136002] RAX: 0000000000000001 RBX: ffff959c10fe7038 RCX: 0000000000000000
[509728.136002] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff959c10fe7038
[509728.136002] RBP: ffffbc80c5de3d30 R08: 0000000000000000 R09: 0000000000000000
[509728.136002] R10: ffffbc80c5de3e40 R11: ffff959c08ba8410 R12: ffff959c11db2200
[509728.136002] R13: ffff959c10fe7000 R14: ffff959c11a802a4 R15: ffff959c11a80200
[509728.136002] FS: 0000000000000000(0000) GS:ffff959c15640000(0000) knlGS:0000000000000000
[509728.136002] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[509728.136002] CR2: 00007f1752676bd0 CR3: 000000017040a000 CR4: 00000000001406e0
[509728.136002] Call Trace:
[509728.136002] _raw_spin_lock+0x20/0x30
[509728.136002] cifsFileInfo_put+0x8c/0x430 [cifs]
[509728.136002] ? __slab_free+0xd0/0x2f0
[509728.136002] ? kmem_cache_free+0x1cb/0x1e0
[509728.136002] cifs_close+0x1e/0x40 [cifs]
[509728.136002] ? cifs_close+0x1e/0x40 [cifs]
[509728.136002] __fput+0xea/0x220
[509728.136002] ____fput+0xe/0x10
[509728.136002] task_work_run+0x8a/0xb0
[509728.136002] do_exit+0x2de/0xb50
[509728.136002] rewind_stack_do_exit+0x17/0x20
[509728.136002] RIP: 0033:0x7fbe2c393c60
[509728.136002] RSP: 002b:00007ffdd29e23a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
[509728.136002] RAX: ffffffffffffffda RBX: 00007ffdd29e2650 RCX: 00007fbe2c393c60
[509728.136002] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000563a210a2c50
[509728.136002] RBP: 0000563a210ba530 R08: 0000000000000000 R09: 0000563a210ba530
[509728.136002] R10: 0000000061685475 R11: 0000000000000246 R12: 00007ffdd29e2630
[509728.136002] R13: 00007ffdd29e2650 R14: 00007ffdd29e2650 R15: 00007ffdd29e2650
[509728.136002] Code: 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 0f 1f 44 00 00 ba 01 00 00 00 8b 07 85 c0 75 0a f0 0f b1 17 85 c0 75 f2 5d c3 f3 90 <eb>ec 81 fe 00 01 00 00 0f 84 92 00 00 00 41 b8 01 01 00 00 b9

[mbzi (bzied)]

Call trace from :

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.4 LTS"

Kernel :

4.15.0-1013-azure

[76244.156004] watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [nginx:1205]
[76244.156004] Modules linked in: binfmt_misc nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conntrack nf_conntrack iptable_security xt_multiport iptable_filter ip_tables x_tables cmac arc4 md4 nls_utf8 cifsccm fscache kvm_intel kvm irqbypass serio_raw hv_balloon joydev autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear hid_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel hid_hyperv aes_x86_64 crypto_simd glue_helper cryptd hyperv_keyboard hid hv_utils hv_netvsc hyperv_fb cfbfillrect cfbimgblt cfbcopyarea pata_acpi
[76244.156004] CPU: 1 PID: 1205 Comm: nginx Tainted: G D L 4.15.0-1013-azure #13~16.04.2-Ubuntu
[76244.156004] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS 090007 06/02/2017
[76244.156004] RIP: 0010:native_queued_spin_lock_slowpath+0x25/0x1a0
[76244.156004] RSP: 0000:ffffb99d82f6ba38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff0c
[76244.156004] RAX: 0000000000000001 RBX: 0000000000000c18 RCX: 0000000000000c18
[76244.156004] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff97cc526da038
[76244.156004] RBP: ffffb99d82f6ba38 R08: ffffb99d82f6bb10 R09: ffff97cc525fa880
[76244.156004] R10: ffff97cc526da000 R11: ffffffffc04980e0 R12: ffff97cc51e81e50
[76244.156004] R13: ffff97cc526da038 R14: ffff97cc51e81eb0 R15: ffffb99d82f6bb08
[76244.156004] FS: 00007f8afa582740(0000) GS:ffff97cc55640000(0000) knlGS:0000000000000000
[76244.156004] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[76244.156004] CR2: 00007fac3400a218 CR3: 00000002d13a0000 CR4: 00000000001406e0
[76244.156004] Call Trace:
[76244.156004] _raw_spin_lock+0x20/0x30
[76244.156004] is_size_safe_to_change+0x3c/0xd0 [cifs]
[76244.156004] cifs_fattr_to_inode+0x14b/0x5a0 [cifs]
[76244.156004] cifs_get_inode_info+0x215/0xa80 [cifs]
[76244.156004] cifs_revalidate_dentry_attr+0x1d5/0x250 [cifs]
[76244.156004] cifs_revalidate_dentry+0x13/0x30 [cifs]
[76244.156004] cifs_d_revalidate+0x27/0xb0 [cifs]
[76244.156004] lookup_fast+0x270/0x300
[76244.156004] path_openat+0x183/0x13f0
[76244.156004] ? touch_atime+0x36/0xe0
[76244.156004] do_filp_open+0x99/0x110
[76244.156004] ? __check_object_size+0xfc/0x1a0
[76244.156004] ? path_get+0x27/0x30
[76244.156004] ? __alloc_fd+0x46/0x170
[76244.156004] do_sys_open+0x12d/0x290
[76244.156004] ? do_sys_open+0x12d/0x290
[76244.156004] ? task_work_run+0x38/0xb0
[76244.156004] SyS_open+0x1e/0x20
[76244.156004] do_syscall_64+0x73/0x130
[76244.156004] entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[76244.156004] RIP: 0033:0x7f8af9f66c60
[76244.156004] RSP: 002b:00007ffc32e40df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
[76244.156004] RAX: ffffffffffffffda RBX: 00007ffc32e410a0 RCX: 00007f8af9f66c60
[76244.156004] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 00005628da594c80
[76244.156004] RBP: 00005628da5856b0 R08: 0000000000000000 R09: 0000...

[Jan Kratochvil (jan-kratochvil)]

Try to negotiate higher version of CIFS protocol which deals better with timeouts, for me it helped to use vers=2.0 option but there should be also 2.1/3.0 etc. according to mount.cifs(8). Recent Linux kernels automatically negotiate highest vers supported by client/server but these kernels just defaulted to 1.0.